#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/types.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_MALLOC_H
#include <malloc.h>
#endif
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#include <stdio.h>
#include "libiberty.h"
#include "ansidecl.h"
#include "hashtab.h"
#ifndef CHAR_BIT
#define CHAR_BIT 8
#endif
#define EMPTY_ENTRY ((PTR) 0)
#define DELETED_ENTRY ((PTR) 1)
static unsigned int higher_prime_index PARAMS ((unsigned long));
static hashval_t htab_mod_1 PARAMS ((hashval_t, hashval_t, hashval_t, int));
static hashval_t htab_mod PARAMS ((hashval_t, htab_t));
static hashval_t htab_mod_m2 PARAMS ((hashval_t, htab_t));
static hashval_t hash_pointer PARAMS ((const void *));
static int eq_pointer PARAMS ((const void *, const void *));
static int htab_expand PARAMS ((htab_t));
static PTR *find_empty_slot_for_expand PARAMS ((htab_t, hashval_t));
htab_hash htab_hash_pointer = hash_pointer;
htab_eq htab_eq_pointer = eq_pointer;
#if 0
unsigned int
ceil_log2 (unsigned int x)
{
int i;
for (i = 31; i >= 0 ; --i)
if (x > (1u << i))
return i+1;
abort ();
}
unsigned int
choose_multiplier (unsigned int d, unsigned int *mlp, unsigned char *shiftp)
{
unsigned long long mhigh;
double nx;
int lgup, post_shift;
int pow, pow2;
int n = 32, precision = 32;
lgup = ceil_log2 (d);
pow = n + lgup;
pow2 = n + lgup - precision;
nx = ldexp (1.0, pow) + ldexp (1.0, pow2);
mhigh = nx / d;
*shiftp = lgup - 1;
*mlp = mhigh;
return mhigh >> 32;
}
#endif
struct prime_ent
{
hashval_t prime;
hashval_t inv;
hashval_t inv_m2;
hashval_t shift;
};
static struct prime_ent const prime_tab[] = {
{ 7, 0x24924925, 0x9999999b, 2 },
{ 13, 0x3b13b13c, 0x745d1747, 3 },
{ 31, 0x08421085, 0x1a7b9612, 4 },
{ 61, 0x0c9714fc, 0x15b1e5f8, 5 },
{ 127, 0x02040811, 0x0624dd30, 6 },
{ 251, 0x05197f7e, 0x073260a5, 7 },
{ 509, 0x01824366, 0x02864fc8, 8 },
{ 1021, 0x00c0906d, 0x014191f7, 9 },
{ 2039, 0x0121456f, 0x0161e69e, 10 },
{ 4093, 0x00300902, 0x00501908, 11 },
{ 8191, 0x00080041, 0x00180241, 12 },
{ 16381, 0x000c0091, 0x00140191, 13 },
{ 32749, 0x002605a5, 0x002a06e6, 14 },
{ 65521, 0x000f00e2, 0x00110122, 15 },
{ 131071, 0x00008001, 0x00018003, 16 },
{ 262139, 0x00014002, 0x0001c004, 17 },
{ 524287, 0x00002001, 0x00006001, 18 },
{ 1048573, 0x00003001, 0x00005001, 19 },
{ 2097143, 0x00004801, 0x00005801, 20 },
{ 4194301, 0x00000c01, 0x00001401, 21 },
{ 8388593, 0x00001e01, 0x00002201, 22 },
{ 16777213, 0x00000301, 0x00000501, 23 },
{ 33554393, 0x00001381, 0x00001481, 24 },
{ 67108859, 0x00000141, 0x000001c1, 25 },
{ 134217689, 0x000004e1, 0x00000521, 26 },
{ 268435399, 0x00000391, 0x000003b1, 27 },
{ 536870909, 0x00000019, 0x00000029, 28 },
{ 1073741789, 0x0000008d, 0x00000095, 29 },
{ 2147483647, 0x00000003, 0x00000007, 30 },
{ 0xfffffffb, 0x00000006, 0x00000008, 31 }
};
static unsigned int
higher_prime_index (n)
unsigned long n;
{
unsigned int low = 0;
unsigned int high = sizeof(prime_tab) / sizeof(prime_tab[0]);
while (low != high)
{
unsigned int mid = low + (high - low) / 2;
if (n > prime_tab[mid].prime)
low = mid + 1;
else
high = mid;
}
if (n > prime_tab[low].prime)
{
fprintf (stderr, "Cannot find prime bigger than %lu\n", n);
abort ();
}
return low;
}
static hashval_t
hash_pointer (p)
const PTR p;
{
return (hashval_t) ((long)p >> 3);
}
static int
eq_pointer (p1, p2)
const PTR p1;
const PTR p2;
{
return p1 == p2;
}
inline size_t
htab_size (htab)
htab_t htab;
{
return htab->size;
}
inline size_t
htab_elements (htab)
htab_t htab;
{
return htab->n_elements - htab->n_deleted;
}
static inline hashval_t
htab_mod_1 (x, y, inv, shift)
hashval_t x, y, inv;
int shift;
{
#ifdef UNSIGNED_64BIT_TYPE
__extension__ typedef UNSIGNED_64BIT_TYPE ull;
if (sizeof (hashval_t) * CHAR_BIT <= 32)
{
hashval_t t1, t2, t3, t4, q, r;
t1 = ((ull)x * inv) >> 32;
t2 = x - t1;
t3 = t2 >> 1;
t4 = t1 + t3;
q = t4 >> shift;
r = x - (q * y);
return r;
}
#endif
return x % y;
}
static inline hashval_t
htab_mod (hash, htab)
hashval_t hash;
htab_t htab;
{
const struct prime_ent *p = &prime_tab[htab->size_prime_index];
return htab_mod_1 (hash, p->prime, p->inv, p->shift);
}
static inline hashval_t
htab_mod_m2 (hash, htab)
hashval_t hash;
htab_t htab;
{
const struct prime_ent *p = &prime_tab[htab->size_prime_index];
return 1 + htab_mod_1 (hash, p->prime - 2, p->inv_m2, p->shift);
}
htab_t
htab_create_alloc (size, hash_f, eq_f, del_f, alloc_f, free_f)
size_t size;
htab_hash hash_f;
htab_eq eq_f;
htab_del del_f;
htab_alloc alloc_f;
htab_free free_f;
{
htab_t result;
unsigned int size_prime_index;
size_prime_index = higher_prime_index (size);
size = prime_tab[size_prime_index].prime;
result = (htab_t) (*alloc_f) (1, sizeof (struct htab));
if (result == NULL)
return NULL;
result->entries = (PTR *) (*alloc_f) (size, sizeof (PTR));
if (result->entries == NULL)
{
if (free_f != NULL)
(*free_f) (result);
return NULL;
}
result->size = size;
result->size_prime_index = size_prime_index;
result->hash_f = hash_f;
result->eq_f = eq_f;
result->del_f = del_f;
result->alloc_f = alloc_f;
result->free_f = free_f;
return result;
}
htab_t
htab_create_alloc_ex (size, hash_f, eq_f, del_f, alloc_arg, alloc_f,
free_f)
size_t size;
htab_hash hash_f;
htab_eq eq_f;
htab_del del_f;
PTR alloc_arg;
htab_alloc_with_arg alloc_f;
htab_free_with_arg free_f;
{
htab_t result;
unsigned int size_prime_index;
size_prime_index = higher_prime_index (size);
size = prime_tab[size_prime_index].prime;
result = (htab_t) (*alloc_f) (alloc_arg, 1, sizeof (struct htab));
if (result == NULL)
return NULL;
result->entries = (PTR *) (*alloc_f) (alloc_arg, size, sizeof (PTR));
if (result->entries == NULL)
{
if (free_f != NULL)
(*free_f) (alloc_arg, result);
return NULL;
}
result->size = size;
result->size_prime_index = size_prime_index;
result->hash_f = hash_f;
result->eq_f = eq_f;
result->del_f = del_f;
result->alloc_arg = alloc_arg;
result->alloc_with_arg_f = alloc_f;
result->free_with_arg_f = free_f;
return result;
}
void
htab_set_functions_ex (htab, hash_f, eq_f, del_f, alloc_arg, alloc_f, free_f)
htab_t htab;
htab_hash hash_f;
htab_eq eq_f;
htab_del del_f;
PTR alloc_arg;
htab_alloc_with_arg alloc_f;
htab_free_with_arg free_f;
{
htab->hash_f = hash_f;
htab->eq_f = eq_f;
htab->del_f = del_f;
htab->alloc_arg = alloc_arg;
htab->alloc_with_arg_f = alloc_f;
htab->free_with_arg_f = free_f;
}
#undef htab_create
htab_t
htab_create (size, hash_f, eq_f, del_f)
size_t size;
htab_hash hash_f;
htab_eq eq_f;
htab_del del_f;
{
return htab_create_alloc (size, hash_f, eq_f, del_f, xcalloc, free);
}
htab_t
htab_try_create (size, hash_f, eq_f, del_f)
size_t size;
htab_hash hash_f;
htab_eq eq_f;
htab_del del_f;
{
return htab_create_alloc (size, hash_f, eq_f, del_f, calloc, free);
}
void
htab_delete (htab)
htab_t htab;
{
size_t size = htab_size (htab);
PTR *entries = htab->entries;
int i;
if (htab->del_f)
for (i = size - 1; i >= 0; i--)
if (entries[i] != EMPTY_ENTRY && entries[i] != DELETED_ENTRY)
(*htab->del_f) (entries[i]);
if (htab->free_f != NULL)
{
(*htab->free_f) (entries);
(*htab->free_f) (htab);
}
else if (htab->free_with_arg_f != NULL)
{
(*htab->free_with_arg_f) (htab->alloc_arg, entries);
(*htab->free_with_arg_f) (htab->alloc_arg, htab);
}
}
void
htab_empty (htab)
htab_t htab;
{
size_t size = htab_size (htab);
PTR *entries = htab->entries;
int i;
if (htab->del_f)
for (i = size - 1; i >= 0; i--)
if (entries[i] != EMPTY_ENTRY && entries[i] != DELETED_ENTRY)
(*htab->del_f) (entries[i]);
memset (entries, 0, size * sizeof (PTR));
}
static PTR *
find_empty_slot_for_expand (htab, hash)
htab_t htab;
hashval_t hash;
{
hashval_t index = htab_mod (hash, htab);
size_t size = htab_size (htab);
PTR *slot = htab->entries + index;
hashval_t hash2;
if (*slot == EMPTY_ENTRY)
return slot;
else if (*slot == DELETED_ENTRY)
abort ();
hash2 = htab_mod_m2 (hash, htab);
for (;;)
{
index += hash2;
if (index >= size)
index -= size;
slot = htab->entries + index;
if (*slot == EMPTY_ENTRY)
return slot;
else if (*slot == DELETED_ENTRY)
abort ();
}
}
static int
htab_expand (htab)
htab_t htab;
{
PTR *oentries;
PTR *olimit;
PTR *p;
PTR *nentries;
size_t nsize, osize, elts;
unsigned int oindex, nindex;
oentries = htab->entries;
oindex = htab->size_prime_index;
osize = htab->size;
olimit = oentries + osize;
elts = htab_elements (htab);
if (elts * 2 > osize || (elts * 8 < osize && osize > 32))
{
nindex = higher_prime_index (elts * 2);
nsize = prime_tab[nindex].prime;
}
else
{
nindex = oindex;
nsize = osize;
}
if (htab->alloc_with_arg_f != NULL)
nentries = (PTR *) (*htab->alloc_with_arg_f) (htab->alloc_arg, nsize,
sizeof (PTR *));
else
nentries = (PTR *) (*htab->alloc_f) (nsize, sizeof (PTR *));
if (nentries == NULL)
return 0;
htab->entries = nentries;
htab->size = nsize;
htab->size_prime_index = nindex;
htab->n_elements -= htab->n_deleted;
htab->n_deleted = 0;
p = oentries;
do
{
PTR x = *p;
if (x != EMPTY_ENTRY && x != DELETED_ENTRY)
{
PTR *q = find_empty_slot_for_expand (htab, (*htab->hash_f) (x));
*q = x;
}
p++;
}
while (p < olimit);
if (htab->free_f != NULL)
(*htab->free_f) (oentries);
else if (htab->free_with_arg_f != NULL)
(*htab->free_with_arg_f) (htab->alloc_arg, oentries);
return 1;
}
PTR
htab_find_with_hash (htab, element, hash)
htab_t htab;
const PTR element;
hashval_t hash;
{
hashval_t index, hash2;
size_t size;
PTR entry;
htab->searches++;
size = htab_size (htab);
index = htab_mod (hash, htab);
entry = htab->entries[index];
if (entry == EMPTY_ENTRY
|| (entry != DELETED_ENTRY && (*htab->eq_f) (entry, element)))
return entry;
hash2 = htab_mod_m2 (hash, htab);
for (;;)
{
htab->collisions++;
index += hash2;
if (index >= size)
index -= size;
entry = htab->entries[index];
if (entry == EMPTY_ENTRY
|| (entry != DELETED_ENTRY && (*htab->eq_f) (entry, element)))
return entry;
}
}
PTR
htab_find (htab, element)
htab_t htab;
const PTR element;
{
return htab_find_with_hash (htab, element, (*htab->hash_f) (element));
}
PTR *
htab_find_slot_with_hash (htab, element, hash, insert)
htab_t htab;
const PTR element;
hashval_t hash;
enum insert_option insert;
{
PTR *first_deleted_slot;
hashval_t index, hash2;
size_t size;
PTR entry;
size = htab_size (htab);
if (insert == INSERT && size * 3 <= htab->n_elements * 4)
{
if (htab_expand (htab) == 0)
return NULL;
size = htab_size (htab);
}
index = htab_mod (hash, htab);
htab->searches++;
first_deleted_slot = NULL;
entry = htab->entries[index];
if (entry == EMPTY_ENTRY)
goto empty_entry;
else if (entry == DELETED_ENTRY)
first_deleted_slot = &htab->entries[index];
else if ((*htab->eq_f) (entry, element))
return &htab->entries[index];
hash2 = htab_mod_m2 (hash, htab);
for (;;)
{
htab->collisions++;
index += hash2;
if (index >= size)
index -= size;
entry = htab->entries[index];
if (entry == EMPTY_ENTRY)
goto empty_entry;
else if (entry == DELETED_ENTRY)
{
if (!first_deleted_slot)
first_deleted_slot = &htab->entries[index];
}
else if ((*htab->eq_f) (entry, element))
return &htab->entries[index];
}
empty_entry:
if (insert == NO_INSERT)
return NULL;
if (first_deleted_slot)
{
htab->n_deleted--;
*first_deleted_slot = EMPTY_ENTRY;
return first_deleted_slot;
}
htab->n_elements++;
return &htab->entries[index];
}
PTR *
htab_find_slot (htab, element, insert)
htab_t htab;
const PTR element;
enum insert_option insert;
{
return htab_find_slot_with_hash (htab, element, (*htab->hash_f) (element),
insert);
}
void
htab_remove_elt (htab, element)
htab_t htab;
PTR element;
{
htab_remove_elt_with_hash (htab, element, (*htab->hash_f) (element));
}
void
htab_remove_elt_with_hash (htab, element, hash)
htab_t htab;
PTR element;
hashval_t hash;
{
PTR *slot;
slot = htab_find_slot_with_hash (htab, element, hash, NO_INSERT);
if (*slot == EMPTY_ENTRY)
return;
if (htab->del_f)
(*htab->del_f) (*slot);
*slot = DELETED_ENTRY;
htab->n_deleted++;
}
void
htab_clear_slot (htab, slot)
htab_t htab;
PTR *slot;
{
if (slot < htab->entries || slot >= htab->entries + htab_size (htab)
|| *slot == EMPTY_ENTRY || *slot == DELETED_ENTRY)
abort ();
if (htab->del_f)
(*htab->del_f) (*slot);
*slot = DELETED_ENTRY;
htab->n_deleted++;
}
void
htab_traverse_noresize (htab, callback, info)
htab_t htab;
htab_trav callback;
PTR info;
{
PTR *slot;
PTR *limit;
slot = htab->entries;
limit = slot + htab_size (htab);
do
{
PTR x = *slot;
if (x != EMPTY_ENTRY && x != DELETED_ENTRY)
if (!(*callback) (slot, info))
break;
}
while (++slot < limit);
}
void
htab_traverse (htab, callback, info)
htab_t htab;
htab_trav callback;
PTR info;
{
if (htab_elements (htab) * 8 < htab_size (htab))
htab_expand (htab);
htab_traverse_noresize (htab, callback, info);
}
double
htab_collisions (htab)
htab_t htab;
{
if (htab->searches == 0)
return 0.0;
return (double) htab->collisions / (double) htab->searches;
}
hashval_t
htab_hash_string (p)
const PTR p;
{
const unsigned char *str = (const unsigned char *) p;
hashval_t r = 0;
unsigned char c;
while ((c = *str++) != 0)
r = r * 67 + c - 113;
return r;
}
#define mix(a,b,c) \
{ \
a -= b; a -= c; a ^= (c>>13); \
b -= c; b -= a; b ^= (a<< 8); \
c -= a; c -= b; c ^= ((b&0xffffffff)>>13); \
a -= b; a -= c; a ^= ((c&0xffffffff)>>12); \
b -= c; b -= a; b = (b ^ (a<<16)) & 0xffffffff; \
c -= a; c -= b; c = (c ^ (b>> 5)) & 0xffffffff; \
a -= b; a -= c; a = (a ^ (c>> 3)) & 0xffffffff; \
b -= c; b -= a; b = (b ^ (a<<10)) & 0xffffffff; \
c -= a; c -= b; c = (c ^ (b>>15)) & 0xffffffff; \
}
hashval_t iterative_hash (k_in, length, initval)
const PTR k_in;
register size_t length;
register hashval_t initval;
{
register const unsigned char *k = (const unsigned char *)k_in;
register hashval_t a,b,c,len;
len = length;
a = b = 0x9e3779b9;
c = initval;
#ifndef WORDS_BIGENDIAN
if (sizeof (hashval_t) == 4 && (((size_t)k)&3) == 0)
while (len >= 12)
{
a += *(hashval_t *)(k+0);
b += *(hashval_t *)(k+4);
c += *(hashval_t *)(k+8);
mix(a,b,c);
k += 12; len -= 12;
}
else
#endif
while (len >= 12)
{
a += (k[0] +((hashval_t)k[1]<<8) +((hashval_t)k[2]<<16) +((hashval_t)k[3]<<24));
b += (k[4] +((hashval_t)k[5]<<8) +((hashval_t)k[6]<<16) +((hashval_t)k[7]<<24));
c += (k[8] +((hashval_t)k[9]<<8) +((hashval_t)k[10]<<16)+((hashval_t)k[11]<<24));
mix(a,b,c);
k += 12; len -= 12;
}
c += length;
switch(len)
{
case 11: c+=((hashval_t)k[10]<<24);
case 10: c+=((hashval_t)k[9]<<16);
case 9 : c+=((hashval_t)k[8]<<8);
case 8 : b+=((hashval_t)k[7]<<24);
case 7 : b+=((hashval_t)k[6]<<16);
case 6 : b+=((hashval_t)k[5]<<8);
case 5 : b+=k[4];
case 4 : a+=((hashval_t)k[3]<<24);
case 3 : a+=((hashval_t)k[2]<<16);
case 2 : a+=((hashval_t)k[1]<<8);
case 1 : a+=k[0];
}
mix(a,b,c);
return c;
}